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Full text of "Handbook Of Chemical Engineering - I"

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REFRACTORIES
477
the so-called melting point of the refractory. One of the essential requirements of the test is that the rate of heating does not exceed 5C. per minute, controlled preferably by the use of an optical pyrometer of the Morse or Holborn-Kurlbaum type.1
FKJ.   1.Gas furnace for refractory testing.
In gas-fired furnaces there is not much danger of heating the specimens too rapidly since the rise in temperature when approaching 3,000F. is slow, but in electric furnaces this is a point which must be watched.
i See p. -Mi).